A good friend died of leukemia when I was 16. I didn't go to her funeral. I was just... so numb. One evening I was in the bathroom brushing my teeth and she appeared near me. She was appearing in a way that my third eye was seeing, but I dismissed it as my imagination. She finally got insistent and loud, which made me look directly at her. She told me to pass some info along to her parents, including details about how to find certain things in her bedroom that her parents needed to see (like her diary, and other items). Her parents had until then not touched the bedroom. They ended up leaving her room exactly as she left it for 5+ years after her death, so they could visit her in there. Anyway, all the items were exactly where she said they'd be, but it took me weeks to have the courage to contact her parents. Even then, I asked my mom to do it because I was too nervous. The findings led her parents on a trip to Europe to visit one of her favourite vacation spots, where they found photos of their family at a local church they had visited 10 years prior. They said time away was exactly what they needed to heal and they ended up finding clues of their daughter everywhere, it was very sweet.
Another time which was more mundane, my friend and I were driving down the highway between townships in the middle of the night from visiting another friend of ours. It was a typical spring night out, so we didn't think much of a woman dressed in all white on the side of the road walking along the highway, even if it was kind of far from civilization. People did that sometimes with their dogs. The only thing is that we both noticed that she had no feet, it was like she was floating off the ground. Her dress also looked really old school... think 1930's. We drove another half a mile while we debated what we just saw, until we turned around and drove back but she was gone. No nature trails or townships anywhere near there, so she either went into the underbrush in a ditch or she really was some kind of ghost.
I have many stories like this... not to mention I grew up in a haunted house. I never get used to it happening no matter how many times it happens, but it sure keeps life interesting.